超过主要r-过程等待点80 Zn的质量测量
Mass measurements beyond the major r-process waiting point 80Zn
摘要：
用潘宁阱质谱计ISOLTRAP对富中子锌同位素~（71）m、~（72- 81）Zn进行了高精度质量测量。首次通过实验测定了81 Zn的质量。这使得80 Zn成为天体物理学快速中子俘获过程中少数几个主要等待点中的第一个，在这个过程中，中子分离能和中子俘获Q值是通过实验确定的。因此，这个等待点所需的天体物理条件及其相关的丰度特征出现在r过程模型中，现在可以精确地映射。测量结果还证实了N = 50髋臼杯闭合对于Z = 30（远离稳定性）的稳健性。
英文摘要：
High-precision mass measurements on neutron-rich zinc isotopes 71m,72-81Zn have been performed with the Penning trap mass spectrometer ISOLTRAP. For the first time the mass of 81Zn has been experimentally determined. This makes 80Zn the first of the few major waiting points along the path of the astrophysical rapid neutron capture process where neutron separation energy and neutron capture Q-value are determined experimentally. As a consequence, the astrophysical conditions required for this waiting point and its associated abundance signatures to occur in r-process models can now be mapped precisely. The measurements also confirm the robustness of the N = 50 shell closure for Z = 30 farther from stability.
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